Brake Servo in F series Tickford Salon

[koke47]

Hi all, anyone know anything about the brake servo in a late Tickford? Found one in my car while trying to bleed breaks. How does the servo effect that process? Lousy picture, looking up at it between right front engine apron and tire, but here it is:




has a tag on it, can’t read much, but think there is an S7 in the parallelogram on tag:





Does engine have to be running for brakes to work? Or should I be able to bleed lines without it working?

Any help appreciated!

[koke47]

Looked up Girling Brake Servo, this one popped up. Looks just like one in my car:GSM125P, listed as aftermarket for MGB! Here’s a schematic:




Even the bracket looks the same!

[koke47]

Here’s a pic of the servo: